Machine for grinding trowels.



No. 70I,83l'. Patanted lune l0, I902.

H. BELTz; MACHINE FOB GRINDING TR'DWELS.

(Application filed Dec. 81, 1901.) (No Model.) 2 Sheets5heet l.

. PatentedJune |0,"|902.' H. BELTZ. v 4 MACHINE FOB GRINDING TROWELS.

(Application filed Dec. 81, 1901.) I (No Mpdel.) 2 shears-snob: 2. 1/ 2?+1 anHWWWIHW m UNITED STATE HARRY BELTZ, or FRANKFORD,PENNSYLVANIA.

MACHIN E FOR cum D'| N G TR OW ELS.

PATENT FFI'CE.

srncrrronrron forming part of Letters Patent No. 701,831, dated June 10,1902.

Application filed December 31, 1901. Serial No. 87,911- (No model.)

To alt whom it nuty concern:

Be it known that I, HARRY BELTZ, a citizen of the United States ofAmerica, residing at Frankford, Philadelphia, county of Philadelphia,and State of Pennsylvania, have invented certain new and usefulImprovements in Machines for Grinding Trowels, of which the followingis-a specification.

This invention relates to machines for grind ing smooth surfaces, andmore particularly to machines for. grinding the faces and backs oftrowels.

The object of 'my invention is to provide a machine for grinding trowelspreparatory to the polishing thereof and to so construct the, same thatthe trowel is taken in the rough state as produced by the rolls orrolling-ma chine and is ground with a smooth, flat, or tapering surface,as may be desired.

Another-object of my invention is to provide a machine for grindingtrowels wherein the trowel is locked in a suitable support held incontact with the grinding-wheel by an adjustable rockingzcarriageadapted to .be controlled by the operator.

With these objects in view and such others as may hereinafter appear myinvention consists in the particular construction of the various partsand in the novel manner of com-' bination and arrangement of said parts,all of which will be fully described, and specific ally pointed out inthe appended claims, which are intended to accord in their terms,spirit, and meaning with the prior state of the art and the existinglaw.

In the drawings forming a part of this specification, Figure 1 is a sideelevation having one of the uprights partly broken away, so as to betterillustrate the rocking carriage and trowel-support. Fig. 2 is a top planview illustrating the block for supporting the trowel when grindingtheback, showing the clamping mechanism partly in dotted lines and thetrowel in position in dotted lines. Fig.3 is a rear View of .the same,the trowel beingomitted. Fig. 4 is a detail perspective of the clampillustrated in Fig. 2. Fig. 5-is a bottom plan view of the trowel-blocksup port. Fig. 6is a front elevation of the same. Fig. 7 is a sideelevation of the block for supporting the trowel when grinding the facethereof. Fig. 8 is a detail view of the slotted snuglyover thecurvedfaces 18.

. bracket. Fig. 9 is a detail perspective of the rocking carriage on anenlarged'scale.

Referring by numerals to the drawings, 1 indicates the floor or base,upon which are mounted two oppositely-disposed uprights 2, havingjournaled'in the top thereof a shaft 3, carrying a grindstone 4, whichmay be driven by any suitable gearing. Mounted upon the uprights are twosliding supports 5, vertically adj ustahle by set-screws o and providedwith grooves 7, adapted to receive and support a horizontal bar 8',having a groove 9 therein extending its entire length, which receivesthe rocking carriage 10, consisting of two arms l1 braced together byhorizontal braces l2,"one of which ispr'ovided with a tongue "13,"having an enlarged portion 14,

adapted to engage the groove 9 and to act as a fulcrum and support forthe arms, the free ends of which are curved, as plainly shown at 15, theother ends being curved up, as shown at 16, and provided withoppositely-disposed supports 17, which are formed thereupon with curvedfaces 18. Mounted upon the supports 17 is a block 19, having slots 20 inthe bottom thereof, adapted to fit The block is provided with. a curvedface 2l, which is corrugated, as shown at 22, and is further providedwith a central -'rib 23,1theobgjectof which will be'hereinafterexplained.

Secured to this block is a chain or rope 24, which is passed through apulley 25, secured to the base or floor, and up through a second pulley26, secured in the top of an upright 27, mounted upon the floor, thencedown to a foot-lever 28, pivoted to the floor, by means of which theblock is moved forward.

The block 19 is adapted to support a block 29, having a curved face 30,which is corrugated, as shown at 31, and centrally grooved at 32. Thiscorrugation and groove are adapted to engage the corrugation and grooveupon the curved face of the'blockal9. The bl ock 29 is providedwith agroove 33 ,in. one end thereof, in which is pivotally secured aclamping-lever 34, connected to a wire 35. This wire passes at an anglethrough'the blockto the the side of the block. This block is furtherprovided with a plate 40, secured to the top thereof, having adepression 41, adapted to receive the rib upon the face of the trowel,and flanges 42 at right angles thereto, adapted to engage the edges atthe heel portion. This form of block is employed when grinding the backof the trowel.

Vhen it is desired to grind the face of a trowel, a block 43 isemployed. This block is substantially the same as block 29. Thecorrugation and groove upon its curved face are the same, so, also, isits manner of engagement with the block 19. However, it differs in therespect that the trowel clamping or locking device consists of twosimilar arms 4i, secured to one end thereof, pivoted between which is anL-shaped lever 45, pivoted to one end of which is an arm 46. This arm ispivoted to the sides of a casing 47 through the slots 48. The casing isfurther supported by a pin 4-9, extending through the arms 44: andengaging the slots 50 in the sides of the easing. This casing is furtherprovided with a curved clamping-arm 51, having a groove 52 therein toengage the shank of the trowel when it is clamped down upon the plate53, secured upon the top of the block, the plate 53 having flange 5%adapted to engage the edges at the heel of the trowel. The L- shapedlever is connected to a wire 55, which passes at an angle through theblock and is connected to a cam-shaped lever 56, the free end of whichis provided with a pivoted arm 57, the end of which is curved so as toengage the ratchet 58 upon the side of the block, and thereby securelylock the trowel in position.

I deem the foregoing explanation sufficiently plain that the inventionwill be readily understood by all conversant in such matters, and Idesire to distinctively state that I do not limit myselfto the exactdetails herein shown and described, since obvious minor changes may bemade without sacrificing any of the advantages of my invention.

Having thus described the various features of my invention, what I claimas new, and desire to secure by Letters Patent, is-

1. In a machine for grinding trowels, a trowel-block, a clamping-leverpivoted in one end thereof, a wire connected to the lever, the said wirepassing through the said block at an angle, a cam-shaped lever pivotedin the block and connected to the wire, a pivoted arm upon thecam-shaped lever, a hook upon the said arm, a ratchet upon the side ofthe block adapted to engage the said hook, a plate upon the top of theblock, the said plate having a depression and flanges, the bottom of theblock having a central groove and corrugations substantially as shownand described.

2. In a machine for grinding trowels, a trowel-block, a clam ping-leverpivoted in one end of the said block, a cam-shaped lever pivoted in theother end, a wire passing through the block at an angle, the said wireconnecting the two lovers, an arm pivoted to the camshaped lever, a hookupon the free end of the said arm, a ratchet upon the side of the blockadapted to engage the said hook, a plate upon the top of the block,aodepression and flanges upon said plate, the bottom of the block beingcurved, a central groove and corrugations upon the curved portion of theblock, substantially as shown and described.

3. A machine for grinding trowels, in combination with a grindstone, anadjustable horizontal bar, a groove in said bar, a rockingcarriage-mounted in said groove, the said carriage consisting of similarcurved handles, braces connecting the said handles, a tongue upon one ofthe said braces, an enlarged portion upon the said tongue,eurved facesformed upon the said handles, a block having slots in the bottom thereofengaging the curved faces upon the handles, the said block connected bya chain to and operated by a foot lever, the top of the block beingcurved, a central rib and corrugations upon the curved portions, atrowel-block adapted to rest upon the first-mentioned block,substantially as shown and described.

4:. A machine for grinding trowels, in combination with a grindstone, anadjustable horizontal bar, a groove in said bar, a rocking carriagemounted in said groove, a sliding block mounted upon said carriage, afootlever connected to and controlling said block, a trowel-blockmounted upon the first-mentioned block, substantially as shown and forthe purpose set forth.

HARRY BELTZ.

\Vitnesses:

HARRY l-I. IIOLLANDER, JAooB BECK.

